14.18. Preview

Preview began life as Mac OS X's built-in graphics viewer—but now, it's much more than that. It's the program you use to view incoming faxes as well as a nearly full-blown clone of Acrobat Reader (the free Adobe program that you used to read PDF files with).

In fact, because Preview now includes searching PDF documents, copying text out of them, adding comments, filling in forms, and clicking live hyperlinks—features that used to be available only in Acrobat Reader—you'd be silly to use Acrobat Reader at all.